// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "net/url_request/url_request_context_getter.h"

#include "base/debug/leak_annotations.h"
#include "base/location.h"
#include "base/single_thread_task_runner.h"
#include "net/url_request/url_request_context.h"
#include "net/url_request/url_request_context_getter_observer.h"

namespace net {

void URLRequestContextGetter::AddObserver(
    URLRequestContextGetterObserver* observer)
{
    DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());
    observer_list_.AddObserver(observer);
}

void URLRequestContextGetter::RemoveObserver(
    URLRequestContextGetterObserver* observer)
{
    DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());
    observer_list_.RemoveObserver(observer);
}

URLRequestContextGetter::URLRequestContextGetter() { }

URLRequestContextGetter::~URLRequestContextGetter() { }

void URLRequestContextGetter::OnDestruct() const
{
    scoped_refptr<base::SingleThreadTaskRunner> network_task_runner = GetNetworkTaskRunner();
    DCHECK(network_task_runner.get());
    if (network_task_runner.get()) {
        if (network_task_runner->BelongsToCurrentThread()) {
            delete this;
        } else {
            if (!network_task_runner->DeleteSoon(FROM_HERE, this)) {
                // Can't force-delete the object here, because some derived classes
                // can only be deleted on the owning thread, so just emit a warning to
                // aid in debugging.
                DLOG(WARNING) << "URLRequestContextGetter leaking due to no owning"
                              << " thread.";
                // Let LSan know we know this is a leak. https://crbug.com/594130
                ANNOTATE_LEAKING_OBJECT_PTR(this);
            }
        }
    }
    // If no IO message loop proxy was available, we will just leak memory.
    // This is also true if the IO thread is gone.
}

void URLRequestContextGetter::NotifyContextShuttingDown()
{
    DCHECK(GetNetworkTaskRunner()->BelongsToCurrentThread());

    // Once shutdown starts, this must always return NULL.
    DCHECK(!GetURLRequestContext());

    FOR_EACH_OBSERVER(URLRequestContextGetterObserver, observer_list_,
        OnContextShuttingDown());
}

TrivialURLRequestContextGetter::TrivialURLRequestContextGetter(
    URLRequestContext* context,
    const scoped_refptr<base::SingleThreadTaskRunner>& main_task_runner)
    : context_(context)
    , main_task_runner_(main_task_runner)
{
}

TrivialURLRequestContextGetter::~TrivialURLRequestContextGetter() { }

URLRequestContext* TrivialURLRequestContextGetter::GetURLRequestContext()
{
    return context_;
}

scoped_refptr<base::SingleThreadTaskRunner>
TrivialURLRequestContextGetter::GetNetworkTaskRunner() const
{
    return main_task_runner_;
}

} // namespace net
